Nut-lock.



T. V. BOYLE.

NUT LOCK.

APPLICATION FILED APB. 9,1908.

898,432, Patented sept. 15, 190s.

wi h1 eooeo h THOMAS V. BOYLE, OF CLEVELAND, OHIO. A

NUT-LOCK.

Specification of Letters Patent.

Patented Sept. 1.5, 1908.

Application filed April 9, 1908. Serial No. 426,081.

l To all lwhom 'it ma, concerns.

'which screw on the threads of the bolt.

Be it known t at I, THoMAs V. BOYLE, citizen of the United States, residing at Cleveland,vin the county of Cuyahoga and State of Ohio, have invented certain/new and useful Improvements in Nut-Locks, of which the following is a specification.

This invention relates to nut locks and has for its object to provide an improved device.

of thekind having several novel features of construction and operation, as will more fully a pear from the following description and t e accompanying drawings.

In the drawings, Figure 1 1s a side view of a bolt provided with the invention. Fi 2 is an end view. Fig. 3 is a section on the ine 3-3 of Fig. 2. Fig. 4 is a section on the line 4 4 of Fig. 2.

y Referring specifically to the drawings, 1 is a bolt with a head 2.` The nut lock comprises a nut 4 having internal and external threads of different pitch the former if t the base the nut has an outwardly extending flange 3. The external threads of thev nut receive a hollow cap 5 having internal threads, and the base or end of the cap 'has on' the inside a segmental notch 7 inclined -at one end and Witha square shoulder at the other. The nut 4 has in the top thereof a lon'- gitudinal hole 9 arranged to register with the notch 7 and this hole contains a pin 6 pressed behind by a spring 8.

The internal and external threads on the nut 4 run in the same direction, and the lock is de endent upon the bind on the threads of the olt produced by relative movement of the inner nut 4 and the outer cap 5. When ythe latter is screwed on theformer the pin 6 snaps behind the shoulder of the notch 7 and locks them together, although the cap ,can still be screwed on somewhat farther, its base being spaced from the flange 3. y In this condition the nut and its cap are screwed on the bolt and against the Work, the wrench being applied to the flange 3 of the nut which extends slightly beyond the side of the ca 5. When the nut is tight the wrench is app ied to the cap-.5 and' this is turned forward, that is, in the same direction the nut was turned, and this brings the threads in the parts 4 and 5 out of itch causing a bind on the threads of the bo t. The nut can be removed by releasing the ca 5 by reverse movement. thereof, to bring t e threads in pitch a ain, after which bothrparts can be turned o the bolt.

The threads come into pitch when the pin 6 reaches the shoulder of the notch 7, and then both arts will turn off together..

I c aim: A nut lock comprising a bolt, a nut thereon having internal and external threads `of different pitch, a cap screwed on the bolt be hind the nut and also having threads engaging with the external threads of the nut, the ca having an internal segmentalnotch With a s oulder at one end thereof and inclined at the other, and a spring catch projecting from the nut into said notch and engaging with the shoulder to prevent removal of the cap from the nut. v

In testimony whereof I aiiix my signature, in presence of two witnesses.

THOMAS V. BOYLE.

Witnesses:

' JOHN BOYLE,

JOHN 4A. BOMMEABDT. 

